“Community” has found its new teacher, and I can describe the casting in two words:

Omar comin’.

Michael Kenneth Williams, beloved by “The Wire” fans for his work as larger-than-life stick-up man Omar Little – and also by “Boardwalk Empire” fans for his current role as non-bookcase-building Chalky White – has agreed to appear in at least three episodes of “Community” season 3.

Each season on “Community,” the study group all takes one class together. In season 1, it was Spanish, with Ken Jeong’s Senor Chang as the instructor. Last season, they took Anthropology, with John Oliver’s Professor Duncan taking over after Betty White got suspended at the end of the premiere. Now it’s Williams’ turn, and he’ll be playing an ex-con who teaches the study group’s Biology class.